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This is a verified interview question from Arista. Candidates reporting seeing this problem in recent Online Assessments (OAs) and onsite rounds. Mastering "Subsequence Count" covers key patterns like Strings.
"Given two strings, find out how many times the first string appears as a subsequence within the second string. A subsequence is formed by removing any number of characters (including zero) from a string without altering the order of the remaining characters."
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